transportation you are doing a fine job running the agriculture department for the nation, why should you leave that job when the president who picked you for that job just got reelected to stay in his job for another four years? it's weird, right, the turnover for the second term. occasionally, people do stay on for a second term or part of a second term. mostly, because either they are tired or because it is tradition. cabinet secretaries move on and frankly, personnel changes at these top echelons at the u.s. government even when these people are good at their jobs, change in the key policy roles does give a chance to put fresh eyes on old problems. that's not just true for the cabinet but true throughout. even before his name was caught up in the david petraeus affair scandal, we knew that this man, general john allen, was on his way out as the commanding general of our war at the cia. because of that affair scandal, david petraeus, is already gone. leon panetta may stay on.